Ultrafast formation of interlayer hot excitons in atomically thin MoS2 /WS2 heterostructures

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

326 Scopus Citations
View graph of relations

Author(s)

  • Hailong Chen
  • Jing Zhang
  • Tianmin Wu
  • Yongji Gong
  • Xiang Zhang
  • Jiangtan Yuan
  • Chongyue Yi
  • Jun Lou
  • Pulickel M. Ajayan
  • Wei Zhuang
  • Guangyu Zhang
  • Junrong Zheng

Detail(s)

Original languageEnglish
Article number12512
Journal / PublicationNature Communications
Volume7
Online published19 Aug 2016
Publication statusPublished - 2016
Externally publishedYes

Link(s)

Abstract

Van der Waals heterostructures composed of two-dimensional transition-metal dichalcogenides layers have recently emerged as a new family of materials, with great potential for atomically thin opto-electronic and photovoltaic applications. It is puzzling, however, that the photocurrent is yielded so efficiently in these structures, despite the apparent momentum mismatch between the intralayer/interlayer excitons during the charge transfer, as well as the tightly bound nature of the excitons in 2D geometry. Using the energy-state-resolved ultrafast visible/infrared microspectroscopy, we herein obtain unambiguous experimental evidence of the charge transfer intermediate state with excess energy, during the transition from an intralayer exciton to an interlayer exciton at the interface of a WS 2 /MoS 2 heterostructure, and free carriers moving across the interface much faster than recombining into the intralayer excitons. The observations therefore explain how the remarkable charge transfer rate and photocurrent generation are achieved even with the aforementioned momentum mismatch and excitonic localization in 2D heterostructures and devices.

Research Area(s)

Citation Format(s)

Ultrafast formation of interlayer hot excitons in atomically thin MoS2 /WS2 heterostructures. / Chen, Hailong; Wen, Xiewen; Zhang, Jing et al.
In: Nature Communications, Vol. 7, 12512, 2016.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

Download Statistics

No data available